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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <div id="app">

        手链价格为:  
            <span v-if="customer.level>=0 && customer.level <=1">9.9</span>
            <span v-else-if="customer.level >= 2 && customer.level <=4">19.9</span>
            <span v-else>29.9</span>

            <hr />
        手链价格为:  
            <span v-show="customer.level>=0 && customer.level <=1">9.9</span>
            <span v-show="customer.level >= 2 && customer.level <=4">19.9</span>
            <span v-show="customer.level>4">29.9</span>    

    </div>

    <script type="module">
        //导入vue模块
        import { createApp} from 'https://unpkg.com/vue@3/dist/vue.esm-browser.js'

        //创建vue应用实例
        createApp({
            data() {
                return {
                    customer: {
                        name: '张三',
                        level: 2
                    }
                }
            }
        }).mount("#app")//控制html元素
    </script>
</body>

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